Question:
The question figure shows the 3D view of an object. Identify the correct number of visible surfaces.
The question figure shows the 3D view of an object. Identify the correct number of visible surfaces.
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Count each distinct planar face visible in the isometric view once: roof faces, box faces, the steps, the groove and the large side faces.
Updated On: Nov 12, 2026
- 11
- 14
- 12
- 13
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The Correct Option is D
Solution and Explanation
Go through the object group by group and count every separate flat face that can be seen.
Roof of the small box: 3 faces (the left sloping triangle, the middle sloping face and the thin sloping strip at the back). Total 3.
Box walls: the face carrying the circle and the narrow face to its right. Total 5.
Raised block on the right: its flat top, its left wall facing the groove and its large right side face (the L-shaped face that includes the step). Total 8.
Lower left platform: its top face, the floor of the groove and the top of the raised strip. Total 11.
The large front-left face of the base (with the notch) is 1 more. Total 12.
The side wall of the groove adds 1. Total 13.
Answer: (4) 13
Roof of the small box: 3 faces (the left sloping triangle, the middle sloping face and the thin sloping strip at the back). Total 3.
Box walls: the face carrying the circle and the narrow face to its right. Total 5.
Raised block on the right: its flat top, its left wall facing the groove and its large right side face (the L-shaped face that includes the step). Total 8.
Lower left platform: its top face, the floor of the groove and the top of the raised strip. Total 11.
The large front-left face of the base (with the notch) is 1 more. Total 12.
The side wall of the groove adds 1. Total 13.
Answer: (4) 13
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